I wouldn't Macgyver a toolset. For something like this, not easy, and your results wouldn't likely be nice.
They aren't broke, I don't think, but it sounds like they do need adjustment. How old are they? If less than a year, take them back to the LBS from whence they came, and they will take care of it. It's a warranty thing. If more than a year, but clearly not abused, I'd still take them back to the LBS from whence they came, and chances are, they will help you out. If you got them online, then, well...
Take them to your LBS! They will adjust them and charge you a small amount to do so, certainly less than buying those tools.
My recommendation.